access control algorithm authorized domain b-cas broadcast flag cnn international cablecard cablelabs cable television in the united states card server card sharing common interface common scrambling algorithm compression networks conax conditional access module conditional access system cryptoworks dvb-ci dvb-cpcm data security digital video broadcasting digital rights management digital television downloadable conditional access system encryption eurocrypt federal communications commission griffin high-bandwidth digital content protection hot bird irdeto access keyfly mediaguard nds group nagravision pay television pirate decryption portable media player powervu ras renewable security reverse engineering seca satellite television scrambling smart card television encryption viaccess videocrypt videoguard videocipher wegener